To modify a subscription with Grove Collaborative, users can log in to their Grove account and navigate to the "Subscriptions" section. This area provides options to manage and edit subscription details, such as changing the frequency of deliveries, updating product selections, or adjusting shipping information. Users can easily add or remove items from their subscription, ensuring that their orders align with their preferences and needs. If a user wishes to change the delivery schedule, they can select a new frequency that fits better with their routine. Additionally, it is possible to browse the latest products available for subscription through Grove's website. For further assistance or more specific inquiries, it is recommended to view the contact information available on the current web page.